Bed and cylinder printing press



Aug. 19, 1930. c. B. COTTRELL. 30 1,773,094

BED AND CYLINDER PRINTING PRESS Filed June 5, 1928 4 Sheets-Sheet lINVENTOR ATTORNEYS 4 Sheets-Sheet 2 INVENTOR ATTORNEYS Aug. 19, 1930. c.B. COTTRELL, 3D

BED AND CYLINDER PRINTING PRESS Filed June 5, 1928 ANN IlllfllA-llllAug. 19, 1930. c. B. COTTRELL, 3D 1,773,094

BED AND CYLINDER PRINTING PRESS Fi led June 5, 1928 4 Sheets-Sheet 3ATTORN EYS Aug. 19, 1930.

C. B. COTTRELL, 3D

BED AND CYLINDER PRINTING PRESS Filed June 5, 1928 4 Sheets-SheetINVENTOR -W /.*/W 241 ATTORNEYS Patented Aug. 19, 1930 UNITED STATESPATENT QFFEE CALVERT B. COTTRELL, 3D, OF WESTERLY, RHODE ISLAND,ASSIGNOR TO C. B. COTTRELL 8c SONS COMPANY, OF WESTERLY, RHODE ISLAND, ACORPORATION OF DELAWARE BED AND CYLINDER PRINTING PRESS Applicationfiled June 5, 1928. Serial No. 282,997.

My invention consists in a four revolutionbed and cylinder one colorprinting press in which a single impression cylinder of comparativelysmall size may be used, said cylinder being arranged to make fourrevolutions during a complete reciprocation of the bed; the cylindermaking two revolutionsin one direction on the forward or printing strokeof the bed and two revolutions in the opposite direction on the returnor non-printing stroke of the bed, the sheet being taken, printed andtransferred to the sheet conveying means of the delivery mechanismduring the first two revolutions of the impression cylinder on theforward or printing stroke of the bed and conveyed to and deposited onthe delivery table during the last two revolutions of the cylinder onthe return or nonprinting stroke of the bed.

The object of my invention is to materially reducethe weight and cost ofthe printing press and also to bring the feed and delivery mechanismsdown into convenient position for the operator.

A motive fluid means is shown for reciprocating the form bed, such meansforming the subject matter of my copending application filed of evendate herewith, its serial number being 282,998.

A practical embodiment of my invention is represented in theaccompanying drawings, in which Fig. 1 represents the printing press inside elevation with the parts in the positions they assume when the formbed is about to start on its forward or printing stroke, the impressioncylinder is about to take a sheet from the feed board and the printedsheet is being deposited on to the delivery table by the conveying meansof the delivery mechanism.

Fig. 2 represents an enlarged detail side view of the impressioncylinder and its adj acent parts, showing more clearlythe severaldevices operated-by the bed for controlling Lthe feeding and delivery ofthe sheets, the

parts being in the positions shown in Fig. 1.

Fig. 3 represents a detail cross section taken in the planes of the lineIIIIII of Fig.

2, looking'in' the direction of the arrows.

Fig. 4 represents a detail longitudinal sec.

tion taken in the plane of the line IV-IV of Fig. 3, looking in thedirection of the arrows with the parts in the positions they assume whenthe leading edge of the sheet is revolution impression cylinder by 4 andits sheet grippers by 5. The usual inking table on the form bedisdenoted by 6, the ink dis-"- tributing rollers by 7 and the form rollersby 8. i

The impression cylinder 4, the circumference of which is substantiallyone-half the stroke of the bed isgeared at'all times to the form bed 2through the rack 9 and gear 10, the cylinder being raised out'of contactwith the form 3 on the return or non-printing stroke of the bed by theusual mechanism denoted by 11.

The sheet feed table of any well known or approved form is denoted by 12and its feed guide by 13.

The sheet delivery mechanism may be of any well known or approved formand it is herein shown as comprising a delivery table 14, areciprocating sheet coveying means 15 and the guides'16,17 for directingthe printed sheets from the impression cylinderto the reciprocatingconveying means.

The motive fluid means for reciprocating the form bed is denotedgenerally by 18 and will not be specifically described herein as itforms the subject matter of my copending application hereinbeforereferred to.

The several devices for controlling the passage of the sheet to and fromthe impression cylinder will be described generally but not in detail asthey may be of any well known .or approved construction.

' In the present instance the bed is provided on one side thereof with afeed guide operating cam 19 arranged in position to engage the stud orroller 20 on the lower end of the bar 21, the upper'end of which isconnected to the rock lever 22 which controls the operation of the feedguide 13 to release the sheet as the cylinder is about to start on itsfirst revolution.

On the same side of the form bed and adj acent to the feed guideoperating cam 19 there is located the cam 23 which is arranged inposition to engage a stud or roller 24 carried by the lateral slidingpin 25 connected to the lever 26 which controls the movement of thetumbler cam pin 27 to bring it into and out of engagement with thegripper tumbler cam 28 for operating the grippers 5 at the proper timeto receive and grasp the head end of the sheet fed from the feed tableas the impression cylinder is about to start on its first revo lution.

T o m b d i al o pro ide o its pp e sid w t a g ipper release cam 29 aranged to engage a stud or roller 30 carried y a. red 31 c nnected toone a m .32 of a rock lever, the other arm 33 of which is provided witha cam 34 arranged in position to engage a stud or roller 35 of an arm 36carried by the impression cylinder gripper shaft, This cam is so locatedthat the impression cylinder grippers 5 will be released as theimpression cylinder starts on its second revolution, for permitting thetransfer of the head end of the sheet to the delivery-mechanism.

To ensure the transfer of the head end of the sheet to the guides 16,17, of the delivery mechanism I also provide the form bed with astripping finger operating cam 37 arranged in position to engage a studor roller 38 on a rod 39 connected to a lever 40 carrying a cam 41arranged to be brought into engagement with a stud or roller 42 carriedby an arm 43 of the stripper shaft 44 so as to raise the stripperfingers 45 at the proper time to direct the head end of the sheetbetween the said guides 16, 17.

To ensure the positive feed of the sheet from the impression cylinder tothe delivery mechanism I provide ooacting rollers 46, 47 adjacent theguides 16, 17 and I also provide rollers 48 arranged to be brought intoengagement with the sheet Whilepn the impression cylinder, said rollers48 being carried by one arm 49 of a rock lever the other arm 50 of whichis connected by a rod 51 to one arm 52 of another rock lever, said lastnamed rock lever having an arm 53 carrying a stud or roller 5% arrangedto be en aged by a cam '55 carried by a gear 56 whic i meshes with agear 57 fast on the impression cylinder shaft 58, exterior to the frame1.

It will be seen, from the above description that I have provided a fourrevolution bed and cylinder one color printing press in which arelatively small impression cylinder may be employed, thereby materiallyreducing the weight and expense of the press and else bringing the feedand delivery mechanisms down into a more accessible position for theoperator.

It is evident that various changes may be resorted to in theconstruction, form and arrangement of the several parts withoutdeparting from the spirit and scope of my invention, hence I do notintend to be limited to the particular embodiment herein shown anddescribed, but what I claim is 2* 1. In a bed and cylinder printingpress, a reciprocating bed and an impression cylinder, said cylinderbeing arranged to make two revolutions in one direction'during theprinting stroke of the bed and two revolutions in the opposite directionduring the non-printing stroke of the bed.

2. In a bed and cylinder printing press, a delivery mechanism, areciprocating bed and n imp ion cy der, said cylinder eing arra g d tomake two re olutions in one di= rection duri g the printing stroke ofthe bed and two re olutions in the opposite d rection during thenonvprinting stroke of the bed, the sheet being taken, printed andtransferred to the delivery mechanism during the first two revolutionsof the cylinder.

3- In a bed and cylinder printin press, a delivery mechanism including aelivery table and means for conveying the printed sheets ther to rom theimpression cylinder, a reciprocating bed and an impression cylinder,said cylinder being arranged during the printing stroke of the bed tomake two new olutions in one direction for taking, print ing andtransferring the sheet to the convey in means Of the delivery mechanismand to make two revolutions in the opposite di rection during thenon-printing stroke of the bed while the sheet conveying means isarrying the printed sheet to and depositing it on the delivery table.

4. In a bed and cylinder printing press, a delivery mechanism, areciprocating bed, an impression cylinder arranged to make tworevolutions in one direction durin the printing stroke of the bed andtwo revolution in the opposite direction during the nonprinting strokeof the bed, the sheet being taken, printed and transferred to thedelivery mechanism during the first two revolutions of the cylinder, andmechanism operable to release the leading end of the sheet before thesecond revolution of the cylinder to permit the transfer of the sheetfrom the cylinder to the delivery mechanism while the sheet is stillbeing printed.

5. In a bed and cylinder printing press, a reciprocating bed and animpression cylinder, the circumference of the impression, cylinder beingsubstantially one-Half the stroke of the bed.

(Lin a bed and cylinder printing a reciprocating bed and an impremjioiicylin der eared at all times thereto, the circumference of theimpression c linder being substantially one-half the stro e of the 7. Ina bed and cylinder printing press, a reciprocating bed and an impressioncylinder, said cylinder being arranged to make two revolutions in onedirection during the printing stroke of the bed and two revolutions inthe opposite direction during the non-printing stroke of the bed,grippers on the cylinder and cams positioned on the bed for operatingthe grippers to cause them to receive and grasp the sheet as thecylinder starts its first revolution and to release the sheet as thecylinder finishes its first revolution.

8. In a bed and cylinder printing press, a delivery mechanism, areciprocating bed and an impression cylinder, said cylinder beingarranged to make two revolutions in one direction during the printingstroke of the bed and two revolutions in the opposite direction duringthe non-printing stroke of the bed, the sheet being taken, printed andtransferred to the delivery mechanism during the first two revolutionsof the cylinder, grippers on the cylinder and cams positioned on the bedfor operating the grippers to cause them to receive and grasp the sheetas the cylinder starts its first revolution and to release the sheet asthe cylinder finishes its first revolution.

In testimony, that I claim the foregoing as my invention, I have signedmy name this first day of June, A. D. 1928.

CALVERT B. COTTRELL, 3RD.

